:root{color-scheme:dark;--bg:#06131b;--panel:#0a2631;--panel2:#0d3039;--line:#286774;--cyan:#46dce7;--mint:#59e1b7;--text:#edf9fb;--muted:#a7bbc2;--gold:#ffd36b}
*{box-sizing:border-box}
html{scroll-behavior:smooth;scroll-padding-top:76px}
body{margin:0;background:linear-gradient(#03131bcc,#03131bcc),repeating-linear-gradient(0deg,transparent 0 54px,#2b829222 55px 56px),repeating-linear-gradient(90deg,transparent 0 54px,#2b829222 55px 56px),radial-gradient(circle at 20% 4%,#0b4554,transparent 32rem),var(--bg);background-attachment:fixed;color:var(--text);font:16px/1.5 system-ui,-apple-system,Segoe UI,sans-serif}
.top,main,footer,.tool-picker,.antenna-intro{width:min(920px,calc(100% - 28px));margin:auto}
.top{padding:18px 0 16px}
.topline{display:flex;align-items:center;justify-content:space-between}
.home-link{color:var(--cyan);font-weight:750;text-decoration:none}
.print-button{width:48px;min-height:44px;padding:8px;background:#0b202a;border-color:#254d58}
.top>p:not(.lead){margin:56px 0 6px;color:var(--mint);font-size:.76rem;font-weight:850;letter-spacing:.22em}
.top h1{margin:0;font-size:clamp(2.15rem,8vw,4.2rem);font-weight:450;line-height:1.05}
.top h1 em{display:block;color:var(--cyan);font-style:normal}
.lead{max-width:640px;color:var(--muted);font-size:1.05rem}
.tool-picker{padding:18px 0}
.tool-picker small,.section-number{display:block;margin-bottom:8px;color:#77e1d1;font-size:.7rem;font-weight:850;letter-spacing:.18em}
.tool-picker select{font-size:1.05rem;font-weight:750}
.antenna-intro{margin-top:8px;padding:28px 0;background:none;border:0;border-radius:0;box-shadow:none}
.antenna-intro h2{font-weight:500}
.tool-cards{display:grid;grid-template-columns:repeat(2,minmax(0,1fr));gap:14px;margin-top:20px}
.tool-cards a{display:grid;gap:7px;padding:22px;border:1px solid #287583;border-radius:18px;background:linear-gradient(145deg,#0d3540,#091b26);color:var(--text);text-decoration:none;box-shadow:0 15px 34px #0005}
.tool-cards a:first-child{border-color:#31c8d0}
.tool-cards small{color:#6edbc7;font-size:.68rem;font-weight:850;letter-spacing:.12em}
.tool-cards strong{font-size:1.15rem;line-height:1.15}
.tool-cards p{margin:0;color:var(--muted);font-size:.9rem}
.tool-cards b{color:var(--cyan);font-size:.78rem}
.card-icon{font-size:1.8rem}
.jump{position:sticky;top:0;z-index:10;display:flex;gap:8px;overflow-x:auto;padding:10px max(14px,calc((100% - 920px)/2));background:#06131bf2;backdrop-filter:blur(10px);border-block:1px solid #173f49}
.jump a{flex:none;padding:8px 12px;border-radius:999px;background:#10313b;color:#bfeef1;text-decoration:none;font-size:.88rem}
main{display:grid;gap:18px;padding:22px 0 48px}
main section{padding:clamp(18px,4vw,30px);border:1px solid var(--line);border-radius:22px;background:linear-gradient(145deg,#0b2d35,#081e29);box-shadow:0 16px 44px #0005}
main section:target{border-color:var(--mint);box-shadow:0 0 0 2px #59e1b733,0 16px 44px #0005}
h2{margin:0 0 6px;font-size:clamp(1.35rem,5vw,2rem)}
main section>p{margin:0 0 18px;color:var(--muted)}
.fields{display:grid;grid-template-columns:repeat(2,minmax(0,1fr));gap:12px}
label{display:grid;gap:6px;color:#cce1e5;font-weight:650}
input,select,button{width:100%;min-height:50px;border:1px solid #397888;border-radius:11px;padding:11px 13px;background:#071923;color:var(--text);font:inherit}
button{align-self:end;border-color:#3dc9a4;background:#174d42;color:#8ff2d0;font-weight:800;cursor:pointer}
button:hover,button:focus-visible{background:#206858}
.quick-frequencies{display:flex;flex-wrap:wrap;gap:8px;margin-top:16px}
.quick-frequencies button{width:auto;min-height:34px;padding:7px 11px;border-radius:999px;background:#0d3540;font-size:.76rem}
output{display:none;margin-top:16px;padding:18px;border:1px solid #2bbdba;border-left:5px solid var(--mint);border-radius:14px;background:#103832;color:#eafff8}
output.show{display:block}
output b{color:var(--mint)}
.bad{border-left-color:#ff997f;background:#412822}
.warning{margin-top:16px!important;padding:13px;border-radius:10px;background:#392b15;color:#ffe09a!important}
.reference h3{color:var(--gold);margin:18px 0 4px}
.reference h3:first-child{margin-top:0}
.reference p{color:#c4d6da}
.reference dl{display:grid;grid-template-columns:70px 1fr;gap:8px 12px}
.reference dt{color:var(--mint);font-weight:800}
.reference dd{margin:0;color:#c4d6da}
footer{padding:8px 0 60px;color:var(--muted)}
footer a{color:var(--cyan);text-decoration:none;font-weight:800}
footer p{max-width:680px}
@media(max-width:620px){.fields,.tool-cards{grid-template-columns:1fr}
.top,main,footer,.tool-picker,.antenna-intro{width:min(100% - 20px,920px)}
main section{border-radius:18px}
.jump{scrollbar-width:none}
.top>p:not(.lead){margin-top:42px}
}
@media print{.jump,.tool-picker,.print-button,.quick-frequencies{display:none!important}
body{background:#fff;color:#111}
.top,main,footer,.antenna-intro{width:100%}
main section,.tool-cards a{break-inside:avoid;background:#fff;color:#111;box-shadow:none}
.lead,main section>p,.tool-cards p,footer{color:#444!important}
}

.loop-pro h3{margin:28px 0 12px;color:#74dfd0;font-size:1rem;letter-spacing:.08em;text-transform:uppercase}
.loop-actions,.compare-actions{display:grid;grid-template-columns:repeat(4,minmax(0,1fr));gap:8px;margin:16px 0}
.loop-actions button,.compare-actions button{min-height:42px;padding:8px;font-size:.78rem}
.loop-actions .danger{border-color:#a9515f;background:#351d27;color:#ff9daf}
.loop-calculate{margin-top:14px}
.loop-results{display:none;margin-top:14px;padding:12px 14px;border:1px solid #6f5ab2;border-radius:10px;background:#241d45}
.loop-results.ready{display:block}
.result-grid{display:grid;grid-template-columns:repeat(2,minmax(0,1fr));gap:10px}
.result-grid article{min-width:0;padding:15px;border:1px solid #205967;border-radius:12px;background:#0b3340;text-align:center}
.result-grid small{display:block;color:#a7bbc2;font-size:.68rem;letter-spacing:.08em}
.result-grid strong{display:block;margin-top:4px;color:#63e5bf;font-size:1.25rem}
.result-grid article:nth-child(3n+2) strong{color:#9fdcff}
.result-grid article:nth-child(3n) strong{color:#ffd36b}
.loop-verdict{display:grid;gap:5px;margin-top:12px;padding:13px;border:1px solid #b18b2e;border-radius:10px;background:#392f16;color:#ffe09a}
.loop-verdict.valid{border-color:#269b75;background:#103a31;color:#8ff2d0}
.loop-verdict span{font-size:.84rem}
.chart-box{overflow:hidden;border:1px solid #286774;border-radius:15px;background:#071923}
.chart-box canvas{display:block;width:100%;height:auto}
.chart-legend{display:flex;justify-content:space-around;gap:8px;padding:8px;color:#a7bbc2;font-size:.75rem}
.loop-notes{margin-top:12px;padding:14px;border:1px solid #765c22;border-radius:11px;background:#2c2415;color:#ffe4a3}
.loop-notes ul{margin:8px 0 0;padding-left:20px}
.comparison-empty,.comparison-table{overflow-x:auto;padding:16px;border:1px dashed #346674;border-radius:12px;color:#a7bbc2}
.comparison-table table{width:100%;border-collapse:collapse;white-space:nowrap}
.comparison-table th,.comparison-table td{padding:9px;border-bottom:1px solid #214b56;text-align:left}
.comparison-table th{color:#69dfc6}
.tech-info{margin-top:18px;padding:14px;border:1px solid #285766;border-radius:11px;background:#081e29}
.tech-info summary{cursor:pointer;color:#85dce4;font-weight:750}
.tech-info p{color:#b6c7cc}
.single-tool main>#magnetic-loop{display:block}
.single-tool .loop-pro{padding-top:22px}
@media(max-width:620px){.loop-actions,.compare-actions{grid-template-columns:repeat(2,minmax(0,1fr))}.loop-fields{grid-template-columns:1fr}.result-grid article{padding:12px 8px}.result-grid strong{font-size:1.05rem}.chart-legend{font-size:.68rem}}